/*
 * This module implements the optional "behind the scenes" invokation
 * of rvinterf from fc-tmsh.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static char rvinterf_pathname[] = "/usr/local/bin/rvinterf";

extern int sock;

char *rvinterf_lopt, *rvinterf_wopt;

launch_rvinterf(ttyport)
	char *ttyport;
{
	int sp[2], rc;
	char *rvif_argv[9], Sarg[16], **ap;

	rc = socketpair(AF_UNIX, SOCK_STREAM, 0, sp);
	if (rc < 0) {
		perror("socketpair");
		exit(1);
	}
	sock = sp[0];
	sprintf(Sarg, "-S%d", sp[1]);
	ap = rvif_argv;
	*ap++ = "rvinterf";
	*ap++ = Sarg;
	*ap++ = "-n";
	if (rvinterf_lopt) {
		*ap++ = "-l";
		*ap++ = rvinterf_lopt;
	}
	if (rvinterf_wopt) {
		*ap++ = "-w";
		*ap++ = rvinterf_wopt;
	}
	*ap++ = ttyport;
	*ap = 0;
	rc = vfork();
	if (rc < 0) {
		perror("vfork for launching rvinterf");
		exit(1);
	}
	if (!rc) {
		/* we are in the child - do the exec */
		close(sp[0]);
		execv(rvinterf_pathname, rvif_argv);
		perror(rvinterf_pathname);
		_exit(1);
	}
	close(sp[1]);
	return 0;
}